ABB LWN2660-6

Detailed Parameter Table

ABB LWN2660-6

Product introduction

The ABB LWN2660-6 is a robust low-voltage molded case circuit breaker designed to protect electrical circuits in industrial and commercial applications. As part of ABB’s LWN series of MCCBs, it combines reliable overcurrent protection with durable construction, making it a critical component in low-voltage distribution systems.

The LWN2660-6 safeguards circuits against overloads, short circuits, and phase imbalances, preventing equipment damage and ensuring electrical safety. Its 630 A rating and 50 kA breaking capacity make it suitable for high-current applications, from factory main distribution panels to commercial building power feeds. Equipped with a thermal-magnetic trip unit, the LWN2660-6 adapts to varying load conditions—providing time-delayed protection for overloads and instant tripping for severe short circuits, balancing safety and operational continuity.

In electrical distribution networks, the LWN2660-6 acts as a first line of defense, isolating faulty circuits to minimize downtime. Its compact design allows integration into standard switchgear, while its modular construction simplifies upgrades or replacements.

Core advantages and technical highlights

High breaking capacity

The LWN2660-6 delivers a 50 kA breaking capacity at 415 V, enabling it to safely interrupt high fault currents common in industrial environments. In a manufacturing plant with large motors, a sudden short circuit could generate 45 kA—well within the LWN2660-6‘s capacity, preventing arc flashes and equipment damage that would otherwise halt production for hours.

Precise protection tuning

The thermal-magnetic trip unit of the LWN2660-6 allows adjustment of overload settings (50-100% of rated current) and short-circuit pickup (5-10x rated current). In a data center, this flexibility lets engineers set the breaker to tolerate temporary inrush currents from server racks during startup, while still tripping instantly for dangerous faults—avoiding unnecessary outages.

Durable construction

Built with high-grade thermoset insulation and copper busbars, the LWN2660-6 withstands ambient temperatures up to 70°C and mechanical vibration. In a food processing plant with washdowns and temperature fluctuations, its robust enclosure resists corrosion and moisture, ensuring reliable operation for over 10 years with minimal maintenance.

Typical application scenarios

In industrial facilities such as automotive factories, the LWN2660-6 protects main distribution circuits feeding production lines. It supplies power to a mix of robotic arms, conveyor systems, and welding equipment, which collectively draw up to 550 A. During a weld spatter-induced short circuit, the LWN2660-6 trips in under 0.1 seconds, isolating the fault to one line and allowing other production areas to continue operating.

In commercial buildings like shopping malls, the LWN2660-6 serves as the main breaker for HVAC and lighting systems. Its 3P+N configuration handles unbalanced loads from tenant spaces, while the thermal trip unit prevents overloads during peak hours (e.g., holiday shopping rushes). Maintenance teams appreciate its easy-access terminals, simplifying periodic inspections.

In renewable energy installations, such as solar PV inverter rooms, the LWN2660-6 protects the AC output circuit from inverter faults. It coordinates with upstream protection devices to ensure selective tripping, so a fault in one inverter doesn’t shut down the entire array—maximizing energy production.

Related model recommendations

LWN2650-6: A lower-current variant (400 A) of LWN2660-6, ideal for smaller industrial circuits or secondary distribution panels in commercial buildings.

LWN2670-6: Higher-capacity upgrade (800 A) with 65 kA breaking capacity, suitable for heavy-industry applications requiring more power than LWN2660-6.

T2N160: ABB’s Tmax series MCCB, compatible with LWN2660-6 in mixed systems, offering electronic trip units for precise protection tuning.

XLP160: Supplementary protection device that pairs with LWN2660-6 to enhance arc-flash mitigation in critical circuits.

LWN2660-3: 3-pole version of LWN2660-6 (no neutral), designed for three-phase-only systems like motor control centers.

E2N250: Compact MCCB from ABB, serving as a replacement for LWN2660-6 in space-constrained enclosures where 630 A capacity isn’t required.

MS132: ABB’s manual motor starter, often used downstream of LWN2660-6 to protect individual motors in industrial lines.

ABB LWN2660-6

Installation, commissioning and maintenance instructions

Installation preparation: Mount LWN2660-6 in a clean, dry switchgear enclosure with adequate ventilation (minimum 100 mm clearance above/below). Use M10 bolts to secure the breaker to the mounting rail, torqueing to 25 Nm. Connect copper busbars (minimum 50 mm²) to the line and load terminals, ensuring tight connections to prevent overheating. Verify the enclosure is grounded before energization, and use appropriate PPE (insulated gloves, face shield) during wiring.

Maintenance suggestions: Inspect LWN2660-6 annually by checking for loose connections or signs of overheating (discoloration). Operate the breaker manually 5-10 times to ensure smooth mechanical action. Test the trip unit every 3 years using a calibration tool, verifying overload and short-circuit settings match the application requirements. Replace worn components (e.g., arc chutes) with ABB-approved parts only. If the breaker trips frequently without cause, check for nuisance overloads or trip unit drift before replacing the entire unit.

Service and guarantee commitment

The LWN2660-6 is backed by a 3-year warranty covering manufacturing defects. ABB’s technical support team provides guidance on selection, installation, and trip-unit settings, with access to online manuals and configuration tools.

Customers benefit from ABB’s global service network, offering on-site testing and maintenance for LWN2660-6 in critical applications. Extended warranty options (up to 5 years) are available, including annual inspection services. ABB maintains regional stock of replacement parts to minimize downtime, ensuring the LWN2660-6 delivers reliable protection throughout its 20-year design life.